Dry placer machine



March 30, 1937. Q NOLTE DRY PLACER MACHINE 5 Sheets-Sheet l Otto JVoZte Filed Feb. 29, 1956 ATTORNEY WITNESS March 30, Q. NOLTE DRY PLACER MACHINE Filed Feb. 29, 1936 3 Sheets-Sheet 2 Owl 5&6

' B, am g f WITNESS ATTORNEY March so, 1937. Q, OL'TE 2,075,747

DRY PLACER MACHINE Filed Feb. 29, 1956 3 Sheets-Sheet 3 ///7W///////////////L T INVENTOR ATTORNEY Patented Mar. 30, 1937 UNlTED STATES PATENT OFFICE 7 Claims.

The invention relates to a dry placer machine and more especially to an automatic dry concentrator.

The primary object of the invention is the provision of a machine of this character, wherein through the use of riffles of a particular formation the fine precious metal can be conveniently separated from the coarser particles of lowerspeciflc gravity so that this fine material can have discharge at a point away from the heavy material and at the bottom of the machine, the machine being of the vibrating type and is of novel construction and will positively screen the finer material from the coarse and separate the gold and concentrates from the sand in a single operation.

Another object of the invention is the provision of a machine of this character, wherein damp or dry material can be conveniently handled for separating the heavier material from the light, the riflles employed in the machine being susceptible of raising movement so as to release the material therefrom for its deposit in a suitable receptacle without necessitating the stopping of the machine in its operation.

A further object of the invention is the provision of a machine of this character, which is comparatively simple in its construction, thoroughly reliable and efficient in its operation,

strong, durable, and inexpensive to manufacture.

With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a side elevation partly in section of 40 a machine constructed in accordance with the invention.

Figure 2 is a top plan view thereof.

Figure 3 is a fragmentary end elevation looking toward the discharge end of the machine.

Figure 4 is a side elevation of the machine.

Figure 5 is a fragmentary vertical transverse sectional view showing in detail the bearings for a movable part of the machine.

Figure 6 is a fragmentary enlarged elevation the eccentric rod and adjuncts.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring to the drawings in detail, the ma- 55 chine comprises a main frame in including vertical legs or uprights H and braces l2, these being made secure in any suitable manner to give rigidity and strength to the main frame. Upon the main frame I0 is supported an inclined vibrating box l3 having fixed thereto upstanding leaf-like springs 14, these being bolted or suitably secured to the main frame l0 and are also engaged between cleats l5 as carried by the sides N5 of the box l3 and thus the latter is held for vibration. K

At one end of the box l3, that is to say the high end thereof, is a feed chute or hopper [1 which leads to a shuflie plate or feed plate I8 located within the box and having an incline corresponding to the incline of said box and above such plate is a screen l9 which is substantially in the same plane with a top or coarse material discharge floor 20, the bottom 2i of said box being of a construction to provide a lower or concentrates floor having air deflectors 22. Rearwardly with respect to the deflectors 22 is a throat 23 having loose connection with the outlet nipple 24 of'a blower casing 25 in which is journaled a bladed blower wheel 26, its axle 21 being journaled in bearings 28 of the ball type and each bearing is built with a lubricating vent or passage 29 and such bearings are fitted with the main frame II].

On the axle 21 is a belt wheel 30 having trained thereover the belt 3| which is also trained over a belt wheel 32 driven from a motor unit 33 through the belt and. pulley connections 34. It is preferable to have the motor 33, which is of the internal combustion type, supported by a base 35 fitted with the uprights ll of the main frame Ill.

The belt wheel 32 is carried by a shaft 36 suitably journaled inbearings 31 on the main frame [0 and this shaft carries an eccentric 38 fitting the strap end 39 of an eccentrically operated throw rod 40 which is also pivoted at 4| to the under side of the box [3 toward the lower end thereof and in this manner the box is vibrated through the influence of the stroke of the rod 40 as actuated by the eccentric 38.

Between the floors 2|] and 2| and extending from the plate 18 to the discharge end of the box [3 is a fine or concentrate screen 42, it being disposed at an incline greater than the incline of the box. Cooperating with the screen 42 is a rifile assembly in the form of a ladder 43 and the rungs of which constitute the stream line riflles 44 which in pairs have straight walls 45 and the curved portions 46, respectively, the straight walls 45 of each pair being in confronting relation to each other and spaced apart as is clearly shown in Figure 1 of the drawings. These rifiles at the bottoms thereof carry felt strips 41 for contact with the screen 42 to eliminate the escaping of material between the riflles and said screen at the points of contact of the felt strips 4'! with the latter. The ladder 43 is hinged by pivots 48 to the sides of the box I3 for vertical swinging movement and the handle ends 49 of this ladder extend beyond the discharge end of the box it for manual lifting of the said ladder. The rifiles 44 of the ladder 43 are held in close relation to the screen 42, that is to say the ladder i 43 is placed against said screen under the influence of a spring 5! having connection at 5| with the box and at 52 with the handle 49. Thus it will be seen that the ladder 43 can be raised to free trapped coarse material 'for the discharge thereof from the screen 42.

The floor 2! next to the discharge end of the box l3 has a concentrates slot 53 opening into a delivery spout 54 for communication with a catch drum, pan or other container 55.

The blower, directs a blast of air through the throat 23 and through the screen 42 and in conjunction therewith the vibration of the box l3 enables .a quick separation of the finer particles from the coarser particles of lower specific gravity of material and these finer particles are discharged through the spout 54 while the larger particles are precipitated over the rifiles 44 and delivered from the discharge end of the box l3 so that finer material will be successfully sep arated from the coarser particles in the working of the machine; The coarser particles are maintained above the creen 42 as the finer material or particles pass through the said screen 42 for deposit on the floor 2| and under the air blast both the coarser particles of lower specific gravity and finer particles of higher specific gravity are precipitated toward the discharge end of the machine, the coarser particles being delivered therefrom at a point different from the delivery of the finer materials or particles through the spout 54.

' It is preferable to feed the raw material from the chute or hopper l! onto the first screen l9, this being the coarse screen in the equipment of the machine, the screen 42 being the fine screen.

The box i3 at the discharge end thereof is open above the screen 42 and closed below it so that the concentrates as carried upon the floor 2| can only be delivered from the box l3 through the slot 53 into the spout 54.

What is claimed is:

l. A machine of the character described comprising a stand, upright leaf spring members carried thereby, an inclined vibrating box carried by said springs and having a bottom forming a concentrates floor, a feed plate, fine and coarse.

screens within said box and related with the feed plate, a top coarse discharge board within said box, a throat formed with the bottom of said box, a blower having loose connection with said throat, means for vibrating the box, and a riflle ladder swingingly mounted within the box and resting upon the fine screen. 7

2. A machine of the character described comprising a stand, upright leaf spring members carried thereby, an inclined vibrating box carried by said springs and having a bottom forming a concentrates floor, a feed plate, fine and coarse screens within said box and related with the feed plate, a top coarse discharge board within,

said box, a throat formed with the bottom of said box, a blower having loose connection with said throat, means for vibrating the box, a riille ladder swingingly mounted within the box and resting upon the fine screen, and a spout communicating with the box through its bottom at the lower end of the latter.

3. A machine of the character described comprising a stand, upright leaf spring members carried thereby, an inclined vibrating box carried by said springs and. having a bottom forming a concentrates floor, a feed plate, fine and coarse screens within said box and related with the feed plate, a top coarse discharge board within said box, a throat formed with the bottom of said box, a blower having loose connection with said throat, means for vibrating the box, a riflle ladder swingingly mounted within the box and resting upon the fine screen, a spout communicating with the box through its bottom at the lower end of the latter, and riffles in said ladder and having rounded sides and a straight wall, the straight walls of adjacent riflles being spaced and in confronting relation to each other.

4. A machine of the character described comprising a stand, upright leaf spring members carried thereby, an inclined vibrating box carried by said springs and having a bottom forming a concentrates floor, a feed plate, fine and coarse screens within said box and related with the feed plate, a top coarse discharge board within said box, a throat formed with the bottom of said box, a blower having l-oose connection with said throat, means for vibrating the box, a riiile ladder swingingly mounted within the box and resting upon the fine screen, a spout communicating with the box through its bottom at the lower end of the latter, riflles in said ladder and having rounded sides and a straight wall, the straight walls of adjacent rifiles being spaced and in confronting; relation to each other, and air deflectors on thebottom of said box.

5. A machine of the character described com-- prising a stand, upright leaf spring members car--' ried thereby, an inclined vibrating box carried by said springs and having a bottom forming a concentrates floor, a feed plate, fine and coarse screens within said box and relatedwith the feed plate, a top coarse discharge board within said box, a throat formed with the bottom of said box, a blower having loose connection with said throat, means for vibrating the box, a rifile ladder swingingly mounted within the box and resting upon the fine screen, a spout communicating with the box through its bottom at the lower end of the latter, riflles in said ladder and having rounded sides and a straight wall, the straight walls of adjacent rililes, being spaced and in confronting relation to each other, air deflectors on the bottom of said box, and felt strips carried by the rifiles and contacting with the fine screen.

6. A machine of the character described comprising a stand, upright leaf sprin members carried thereby, an inclined vibrating box carried by said springs and having a bottom forming a concentrates fioor, a feed plate, fine and coarse screens within said box and related with the feed plate, a top coarse discharge board within said box, a throat formed with the bottom of said box, a blower having loose connection with said throat, means for vibrating the box, a riffle ladder swingingly mounted within the box and resting upon the fine screen, a spout communicating with the box through its bottom at the lower end of the latter, riifles in said ladder and having rounded sides and a straight wall, the straight Walls of adjacent rifiles being spaced and in confronting relationto each other, air deflectors on the bottom of said box, felt strips carried by the riflles and contacting with the fine screen, and means active upon the ladder to maintain the same in position for the contact of the felt strips with the said fine screen.

7. A machine of the character described comprising a stand, upright leaf spring members carried thereby, an inclined vibrating box carried by said springs and having a bottom forming a concentrates fioor, a feed plate, fine and coarse screens within said box and related with the feed plate, a top coarse discharge board within said box, ,a throat formed with the bottom of said box, a blower having loose connection with said throat, means for vibrating the box, a riffle ladder swingingly mounted within the box and resting upon the fine screen, a spout communicating with the box through its bottom at the lower end of the latter, rifiles in said ladder and having rounded sides and a straight wall, the straight walls of adjacent riffles being spaced and in confronting relation to each other, air deflectors on the bottom of said box, felt strips carried by the riflies and contacting with the fine screen, means active upon the ladder to maintain the same in position for the contact of the felt strips with the said fine screen, and handle ends on said ladder and projected beyond the lowermost end of the box.

OTTO NOLTE. 

